In the list, you’ll find people from the past and present who have had a profound influence on both the concept of love—the way people understand and think about romance—and the practice of love—the actions people take to find, pursue and keep it.

There’s no scientific way to determine this kind of influence, but as the experts in love and relationships, we spend hours submerged in this stuff. For the past several months we’ve been thinking, writing and debating who should go on the list.

You’ll encounter expected folks like John Gray, author of the classic, Men Are From Mars, Women Are From Venus, as well as less obvious people, like Facebook founder Mark Zuckerberg, who created a site that has dramatically changed the way we interact with one another…